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756 results on '"Chen, Weifang"'

178. Comprehensive analysis of NAC transcription factors and their expressions during taproot coloration in radish (Raphanus sativus L.)

Author

Huang, Yan, primary, Cui, Lei, additional, Chen, Weifang, additional, Liu, Zhixiong, additional, Yuan, Weiling, additional, Zhu, Fengjuan, additional, Jiao, Zhenbiao, additional, Zhang, Zhenxing, additional, Deng, Xiaohui, additional, Wang, Liping, additional, Qiu, Zhengming, additional, and Yan, Chenghuan, additional

Published
2022
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180. Preparation of biochar derived from waste cotton woven by low-dosage Fe(NO3)3 activation: characterization, pore development, and adsorption.

Author

Xu, Zhihua, Wang, Yongheng, Wu, Mingzhen, and Chen, Weifang

Subjects
BIOCHAR, POROSITY, ADSORPTION (Chemistry), IRON oxides, ADSORPTION capacity, WEAVING patterns
Abstract

Currently, researchers are looking for efficient and sustainable methods to synthesize biochar for the adsorption of pollutants. In this study, biochar with high specific surface area, tunable pore structure, and abundant functional groups were prepared from waste cotton woven (WCW) using low-dosage Fe(NO3)3 activation at 400–900 °C. The biochar obtained at 800 °C possessed the excellent specific surface area of 1167.37 m2/g with a unique micro-mesoporous structure. XRD analysis showed that the Fe species changed from Fe2O3 to Fe3O4 and then Fe0 with the increase of pyrolysis temperature. TEM images further confirmed the template effect of iron oxides for mesoporous formation. The effect of Fe(NO3)3 on the pyrolysis pathway of waste cotton woven was systematically investigated by TG and XPS analyses to explore the pore development of biochar. The results indicated that Fe(NO3)3 could enhance the dehydration, decarbonylation and dehydroxylation of WCW components, thereby reducing the temperature required for WCW pyrolysis. Moreover, the synergistic effect of Fe and N species improved the development of microporous and mesoporous structure through carbon structure corrosion and reorganization, and volatile release. Additionally, satisfactory adsorption capacity for Eriochrome Black T (456.01 mg/g) of the prepared biochar was obtained at 25 °C. This study demonstrated that low-dosage Fe(NO3)3 activation of waste cotton woven could be used as a facile method to prepare promising inexpensive biochar for contaminants removal. [ABSTRACT FROM AUTHOR]

Published
2023
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181. Contribution analysis of vibration transmission path of planetary reducer box based on velocity involvement loss.

Author

Li, Miaomiao, Liu, Qinwen, Zhu, Shixuan, Ai, Sheng, Chen, Weifang, and Zhu, Rupeng

Subjects
VIBRATION tests, VELOCITY, INFECTIOUS disease transmission, GEARBOXES, GEARING machinery vibration
Abstract

Planetary reducer box undertakes the vibration transmitted from gear transmission system to bearing, and further transmits the vibration to the base. Research on the transmission path contribution of reducer box has an important guiding role in reducing vibration. This paper first analyzed the contribution of each vibration path of the gearbox based on the velocity intervention loss, so as to identify the main transmission path of the gearbox vibration; then the vibration test of the gearbox is carried out to verify the correctness of the transmission path model. The results show that the vibration transmission path of the right bearing of the gearbox is the main transmission path, and the established vibration transmission path dynamics model of the gearbox can well reveal the contribution law of the vibration transmission path of the gearbox. [ABSTRACT FROM AUTHOR]

Published
2023
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187. Development of Intelligent Terminal-based Signal Acquisition System for Cochlear Implant

Author

Chen Yousheng and Chen Weifang

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

Present speech recognition of cochlear implant is still low for situation of noisy environment or under mismatch condition, and more researches focus on improving front-end signal acquisition and speech recognition. To simplify signal acquisition and algorithm research, we develop an intelligent terminal-based signal acquisition system for cochlear implant, in which the electric relay and many sensors are adopted to implement system monitoring function. The proposed system platform is helpful to actualize algorithm research and intelligent monitoring, adding to its value of further research of speech recognition improvement.

Published
2018
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